Modes of awareness associated with use of caffeine

Caffeine-containing beverages and plants are consumed for their stimulant effect and increased conviviality. They give a lift and assist clear thinking. Caffeine intoxication may also be unpleasant, causing restlessness and insomnia, for example. Overdose may induce rambling of thoughts and speech, and sensory disturbance or, in extreme cases, seizure and respiratory failure.